Mayor de Blasio plans to offer 20% of seats at specialized high schools to low-income students who just missed test-score cutoff

Parents at a high-achieving Brooklyn middle school plan to meet Tuesday to decide whether to file a lawsuit against a city plan that some say could hurt their children’s chances of getting into coveted specialized high schools.

The Parent Teacher Organization at I.S. 187, known as the Christa McAuliffe School, sent an email inviting its members to an urgent meeting with a presentation by nonprofit lawyers.